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Hi Everyone. As in topic, i try to use SolidWoks API, but I cannot proper open reference to any object (via constructor node and creating static ref). Im getting error: "Error 1172 occurred at Property Node (Arg :1) Error accessing property SolidWorks.Interop.sldworks.ISldWorks.ActiveDoc, (System.ArgumentNullException: Key cannot be null. Parameter name: key)" It's no matter if i load assembly from GAC or directly from project directory. Always the same. I've tried every idea i had. Can anyone help me with this? I enclose API (.net 4.0) for those, who want to help. Thanks a lot! Zyga SW_API.